What are the differences between Project Tool and Define Projection?

Project Tools

-acts on x-y coordinate of a layer and converts them to a different coordinate system, producing a new feature class and leaving the original feature class unchanged.
-convert a layer in one coordinate system to another
-should be used only on layers that already work properly and appear in the right location.

Define Projection

– changes the projection system label of the feature class without affecting the coordinates inside.
-just labels the projection system
-should be used only on a dataset that has an Unknown coordinate system or a data set that was previously mislabeled, does not appear in the right location, and needs to be fixed.

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